[CH3:1][O:2][CH:3]1[C:7]([C:8]([NH2:10])=[O:9])=[CH:6][S:5][CH2:4]1.S(Cl)(Cl)(=O)=O>C(Cl)(Cl)(Cl)Cl>[CH3:1][O:2][C:3]1[C:7]([C:8]([NH2:10])=[O:9])=[CH:6][S:5][CH:4]=11.59 Parts of 3-methoxy-dihydrothiophene-4-carboxylic acid amide are reacted with 0.88 part by volume of sulfuryl chloride in 25 parts by volume of carbon tetrachloride in the course of 2 hours at 0° C. The end product is isolated from the reaction mixture by the method described in Example 1c. 1.17 parts (75% of theory) of 3-methoxythiophene-4-carboxylic acid amide are obtained.
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